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\begin{equation*}\frac{\Delta^3F(P_0)}{\Delta_1P^3}=\frac{\Delta^2 F'(P_0)}{\Delta_1P^2}=\frac{\Delta F''(P_0)}{\Delta_1P}
=\frac{\frac{\Delta F'(P_1)}{\Delta_1P}-\frac{\Delta F'(P_0)}{\Delta_1P}}{\Delta_1P},\,\!\end{equation*}
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